They make some nice slugs now so that should help a lot. I would go with the fifty for the site in by the way you describe it there. Also they are capable of a much longer shots than that, no doubt about it. I would than see what it would do at farther distance's. Like 75, 100, 125 or what ever you like. Do alot of practice no matter what distance your sighted in for. Makes yourself better, and know were it is. A slug will drop real fast on you. You may consider 100 yards on the sight in, and again try it at differnt distances more close. But practice just for myself is the key no matter what your using. It does make you a better marksman, and will build your confidence.